// Define match-highlighter commands. Depends on searchcursor.js
// Use by attaching the following function call to the onCursorActivity event:
//myCodeMirror.matchHighlight(minChars);
// And including a special span.CodeMirror-matchhighlight css class (also optionally a separate one for .CodeMirror-focused -- see demo matchhighlighter.html)

(function () {
    var DEFAULT_MIN_CHARS = 2;

    function MatchHighlightState() {
        this.marked = [];
    }

    function getMatchHighlightState(cm) {
        return cm._matchHighlightState || (cm._matchHighlightState = new MatchHighlightState());
    }

    function clearMarks(cm) {
        var state = getMatchHighlightState(cm);
        for (var i = 0; i < state.marked.length; ++i)
            state.marked[i].clear();
        state.marked = [];
    }

    function markDocument(cm, className, minChars) {
        clearMarks(cm);
        minChars = (typeof minChars !== 'undefined' ? minChars : DEFAULT_MIN_CHARS);
        if (cm.somethingSelected() && cm.getSelection().replace(/^\s+|\s+$/g, "").length >= minChars) {
            var state = getMatchHighlightState(cm);
            var query = cm.getSelection();
            cm.operation(function () {
                if (cm.lineCount() < 2000) { // This is too expensive on big documents.
                    for (var cursor = cm.getSearchCursor(query); cursor.findNext();) {
                        //Only apply matchhighlight to the matches other than the one actually selected
                        if (!(cursor.from().line === cm.getCursor(true).line && cursor.from().ch === cm.getCursor(true).ch))
                            state.marked.push(cm.markText(cursor.from(), cursor.to(), className));
                    }
                }
            });
        }
    }

    CodeMirror.defineExtension("matchHighlight", function (className, minChars) {
        markDocument(this, className, minChars);
    });
})();
